Where available, use utime() or utimes() to update the file mod time

of the socket file and socket lock file; this should prevent both of them
from being removed by even the stupidest varieties of /tmp-cleaning
script.  Per suggestion from Giles Lean.

configure

@@ -6887,7 +6887,8 @@ done
 
 
 
-for ac_header in crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/shm.h sys/un.h termios.h kernel/OS.h kernel/image.h SupportDefs.h
+
+for ac_header in crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/shm.h sys/un.h termios.h utime.h kernel/OS.h kernel/image.h SupportDefs.h
 do
 as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
 if eval "test \"\${$as_ac_Header+set}\" = set"; then
@@ -9819,7 +9820,9 @@ test $ac_cv_func_memcmp_working = no && LIBOBJS="$LIBOBJS memcmp.$ac_objext"
 
 
 
-for ac_func in cbrt fcvt getpeereid memmove pstat setproctitle setsid sigprocmask sysconf waitpid dlopen fdatasync
+
+
+for ac_func in cbrt fcvt getpeereid memmove pstat setproctitle setsid sigprocmask sysconf waitpid dlopen fdatasync utime utimes
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5

configure.in

 dnl Process this file with autoconf to produce a configure script.
-dnl $Header: /cvsroot/pgsql/configure.in,v 1.232 2003/01/11 04:58:44 momjian Exp $
+dnl $Header: /cvsroot/pgsql/configure.in,v 1.233 2003/01/25 05:19:45 tgl Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -675,7 +675,7 @@ fi
 ##
 
 dnl sys/socket.h is required by AC_FUNC_ACCEPT_ARGTYPES
-AC_CHECK_HEADERS([crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/shm.h sys/un.h termios.h kernel/OS.h kernel/image.h SupportDefs.h])
+AC_CHECK_HEADERS([crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/shm.h sys/un.h termios.h utime.h kernel/OS.h kernel/image.h SupportDefs.h])
 
 # At least on IRIX, cpp test for netinet/tcp.h will fail unless
 # netinet/in.h is included first.
@@ -782,7 +782,7 @@ PGAC_FUNC_GETTIMEOFDAY_1ARG
 # SunOS doesn't handle negative byte comparisons properly with +/- return
 AC_FUNC_MEMCMP
 
-AC_CHECK_FUNCS([cbrt fcvt getpeereid memmove pstat setproctitle setsid sigprocmask sysconf waitpid dlopen fdatasync])
+AC_CHECK_FUNCS([cbrt fcvt getpeereid memmove pstat setproctitle setsid sigprocmask sysconf waitpid dlopen fdatasync utime utimes])
 
 AC_CHECK_DECLS(fdatasync, [], [], [#include <unistd.h>])
 

src/backend/libpq/pqcomm.c

@@ -29,7 +29,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- *	$Id: pqcomm.c,v 1.146 2003/01/14 22:52:57 momjian Exp $
+ *	$Id: pqcomm.c,v 1.147 2003/01/25 05:19:46 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -41,6 +41,7 @@
  *		StreamServerPort	- Open postmaster's server port
  *		StreamConnection	- Create new connection with client
  *		StreamClose			- Close a client/backend connection
+ *		TouchSocketFile		- Protect socket file against /tmp cleaners
  *		pq_init			- initialize libpq at backend startup
  *		pq_close		- shutdown libpq at backend exit
  *
@@ -66,15 +67,19 @@
 #include <fcntl.h>
 #include <grp.h>
 #include <unistd.h>
-#include <sys/stat.h>
+#include <sys/file.h>
 #include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/time.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #ifdef HAVE_NETINET_TCP_H
 #include <netinet/tcp.h>
 #endif
 #include <arpa/inet.h>
-#include <sys/file.h>
+#ifdef HAVE_UTIME_H
+#include <utime.h>
+#endif
 
 #include "libpq/libpq.h"
 #include "miscadmin.h"
@@ -87,8 +92,8 @@ extern ssize_t secure_write(Port *, const void *, size_t);
 static void pq_close(void);
 
 #ifdef HAVE_UNIX_SOCKETS
-int 	Lock_AF_UNIX(unsigned short portNumber, char *unixSocketName);
-int		Setup_AF_UNIX(void);
+static int	Lock_AF_UNIX(unsigned short portNumber, char *unixSocketName);
+static int	Setup_AF_UNIX(void);
 #endif   /* HAVE_UNIX_SOCKETS */
 
 #ifdef HAVE_IPV6
@@ -175,12 +180,14 @@ static char sock_path[MAXPGPATH];
  * Shutdown routine for backend connection
  * If a Unix socket is used for communication, explicitly close it.
  */
+#ifdef HAVE_UNIX_SOCKETS
 static void
 StreamDoUnlink(void)
 {
 	Assert(sock_path[0]);
 	unlink(sock_path);
 }
+#endif   /* HAVE_UNIX_SOCKETS */
 
 /*
  * StreamServerPort -- open a sock stream "listening" port.
@@ -345,12 +352,13 @@ StreamServerPort(int family, char *hostName, unsigned short portNumber,
 
 }
 
+
+#ifdef HAVE_UNIX_SOCKETS
+
 /*
  * Lock_AF_UNIX -- configure unix socket file path
  */
-
-#ifdef HAVE_UNIX_SOCKETS
-int
+static int
 Lock_AF_UNIX(unsigned short portNumber, char *unixSocketName)
 {
 	SockAddr	saddr;	/* just used to get socket path */
@@ -377,7 +385,7 @@ Lock_AF_UNIX(unsigned short portNumber, char *unixSocketName)
 /*
  * Setup_AF_UNIX -- configure unix socket permissions
  */
-int
+static int
 Setup_AF_UNIX(void)
 {
 	/* Arrange to unlink the socket file at exit */
@@ -429,6 +437,7 @@ Setup_AF_UNIX(void)
 	}
 	return STATUS_OK;
 }
+
 #endif   /* HAVE_UNIX_SOCKETS */
 
 
@@ -506,6 +515,38 @@ StreamClose(int sock)
 	close(sock);
 }
 
+/*
+ * TouchSocketFile -- mark socket file as recently accessed
+ *
+ * This routine should be called every so often to ensure that the socket
+ * file has a recent mod date (ordinary operations on sockets usually won't
+ * change the mod date).  That saves it from being removed by
+ * overenthusiastic /tmp-directory-cleaner daemons.  (Another reason we should
+ * never have put the socket file in /tmp...)
+ */
+void
+TouchSocketFile(void)
+{
+	/* Do nothing if we did not create a socket... */
+	if (sock_path[0] != '\0')
+	{
+		/*
+		 * utime() is POSIX standard, utimes() is a common alternative.
+		 * If we have neither, there's no way to affect the mod or access
+		 * time of the socket :-(
+		 *
+		 * In either path, we ignore errors; there's no point in complaining.
+		 */
+#ifdef HAVE_UTIME
+		utime(sock_path, NULL);
+#else /* !HAVE_UTIME */
+#ifdef HAVE_UTIMES
+		utimes(sock_path, NULL);
+#endif /* HAVE_UTIMES */
+#endif /* HAVE_UTIME */
+	}
+}
+
 
 /* --------------------------------
  * Low-level I/O routines begin here.

src/backend/postmaster/postmaster.c

@@ -37,7 +37,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.305 2003/01/16 00:26:44 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.306 2003/01/25 05:19:46 tgl Exp $
  *
  * NOTES
  *
@@ -2678,6 +2678,7 @@ SSDataBase(int xlop)
 		 * do other actions that should happen every now and then on no
 		 * particular schedule.  Such as...
 		 */
+		TouchSocketFile();
 		TouchSocketLockFile();
 	}
 

src/backend/utils/init/miscinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.98 2002/12/05 04:04:46 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.99 2003/01/25 05:19:46 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -16,8 +16,9 @@
 
 #include <sys/param.h>
 #include <signal.h>
-#include <sys/stat.h>
 #include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/time.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <grp.h>
@@ -25,6 +26,9 @@
 #include <errno.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#ifdef HAVE_UTIME_H
+#include <utime.h>
+#endif
 
 #include "catalog/catname.h"
 #include "catalog/pg_shadow.h"
@@ -872,27 +876,42 @@ CreateSocketLockFile(const char *socketfile, bool amPostmaster)
 }
 
 /*
- * Re-read the socket lock file.  This should be called every so often
- * to ensure that the lock file has a recent access date.  That saves it
+ * TouchSocketLockFile -- mark socket lock file as recently accessed
+ *
+ * This routine should be called every so often to ensure that the lock file
+ * has a recent mod or access date.  That saves it
  * from being removed by overenthusiastic /tmp-directory-cleaner daemons.
  * (Another reason we should never have put the socket file in /tmp...)
  */
 void
 TouchSocketLockFile(void)
 {
-	int			fd;
-	char		buffer[1];
-
 	/* Do nothing if we did not create a socket... */
 	if (socketLockFile[0] != '\0')
 	{
-		/* XXX any need to complain about errors here? */
+		/*
+		 * utime() is POSIX standard, utimes() is a common alternative;
+		 * if we have neither, fall back to actually reading the file
+		 * (which only sets the access time not mod time, but that should
+		 * be enough in most cases).  In all paths, we ignore errors.
+		 */
+#ifdef HAVE_UTIME
+		utime(socketLockFile, NULL);
+#else /* !HAVE_UTIME */
+#ifdef HAVE_UTIMES
+		utimes(socketLockFile, NULL);
+#else /* !HAVE_UTIMES */
+		int			fd;
+		char		buffer[1];
+
 		fd = open(socketLockFile, O_RDONLY | PG_BINARY, 0);
 		if (fd >= 0)
 		{
 			read(fd, buffer, sizeof(buffer));
 			close(fd);
 		}
+#endif /* HAVE_UTIMES */
+#endif /* HAVE_UTIME */
 	}
 }
 

src/include/libpq/libpq.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: libpq.h,v 1.55 2003/01/06 03:18:27 momjian Exp $
+ * $Id: libpq.h,v 1.56 2003/01/25 05:19:47 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -49,6 +49,7 @@ extern int StreamServerPort(int family, char *hostName,
 			  unsigned short portNumber, char *unixSocketName, int *fdP);
 extern int	StreamConnection(int server_fd, Port *port);
 extern void StreamClose(int sock);
+extern void TouchSocketFile(void);
 extern void pq_init(void);
 extern int	pq_getbytes(char *s, size_t len);
 extern int	pq_getstring(StringInfo s, int maxlen);

src/include/pg_config.h.in

@@ -8,7 +8,7 @@
  * or in pg_config.h afterwards.  Of course, if you edit pg_config.h, then your
  * changes will be overwritten the next time you run configure.
  *
- * $Id: pg_config.h.in,v 1.37 2003/01/06 06:07:20 momjian Exp $
+ * $Id: pg_config.h.in,v 1.38 2003/01/25 05:19:47 tgl Exp $
  */
 
 #ifndef PG_CONFIG_H
@@ -383,6 +383,9 @@
 /* Set to 1 if you have <termios.h> */
 #undef HAVE_TERMIOS_H
 
+/* Set to 1 if you have <utime.h> */
+#undef HAVE_UTIME_H
+
 /* Set to 1 if you have <sys/pstat.h> */
 #undef HAVE_SYS_PSTAT_H
 
@@ -520,6 +523,12 @@
 /* Define if you have fdatasync() */
 #undef HAVE_FDATASYNC
 
+/* Define if you have utime() */
+#undef HAVE_UTIME
+
+/* Define if you have utimes() */
+#undef HAVE_UTIMES
+
 /* Define if the standard header unistd.h declares fdatasync() */
 #undef HAVE_DECL_FDATASYNC